...

examcloud-core-examwork-api-provider/src/main/java/cn/com/qmth/examcloud/core/examwork/api/controller/ExamStudentController.java

@@ -236,7 +236,8 @@ public class ExamStudentController extends ControllerSupport {
 			bean.setExamType(exam.getExamType().name());
 			bean.setUpdateTime(cur.getUpdateTime());
 			bean.setEnable(cur.getEnable());
-			bean.setLocked(exam.getExamStudentLocked());
+			bean.setLocked(
+					null == exam.getExamStudentLocked() ? false : exam.getExamStudentLocked());
 			bean.setStarted(started);
 
 			ret.add(bean);